About 4.5 billion years ago, the most momentous event in the history of Earth occurred: a huge celestial body called Theia collided with the young Earth. How the collision unfolded and what exactly ...

A new analysis of rocks thought to be at least 2.5 billion years old helps clarify the chemical history of Earth's mantle -- the geologic layer beneath the planet's crust. The findings hone scientists ...

Add Yahoo as a preferred source to see more of our stories on Google. An illustration of Earth 200 million years ago as Pangaea, the last supercontinent, began to break apart. The continents we live ...

We live in a rapidly warming world. Immense volumes of human-generated greenhouse gases are nudging Earth’s climate to a warmer and warmer state, further changing our planet as sea levels rise, living ...

700 million years ago, Earth was a giant snowball cloaked in ice from pole to pole – a global deep freeze that held the planet in a stranglehold, threatening the survival of the earliest complex life.

Tiny bits of Earth’s atmosphere have been drifting to the moon for billions of years, guided by Earth’s magnetic field. Rather than blocking particles, the magnetic field can funnel them along ...

NASA’s Explorer 6 satellite was launched Aug. 7, 1959, from Cape Canaveral, Florida. The spacecraft’s mission was to study Earth’s magnetic fields and radiation, as well as cosmic rays, geomagnetism, ...

A thin slice of the ancient rocks collected from Gakkel Ridge near the North Pole, photographed under a microscope and seen under cross-polarized light. Field width ~ 14mm. Credit: E. Cottrell, ...